Swarovski BTX 30x/35x Eyepiece Module for ATX/STX Spotting Scopes

Swarovski BTX 30x/35x Eyepiece Module for ATX/STX Spotting Scopes

Swarovski BTX 30x/35x Eyepiece Module for ATX/STX Spotting Scopes

B&H # SWBTXEM MFR # 49903
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Product Highlights

  • View with Both Eyes Open
  • 45° Angled Viewing
  • 35x with 95mm Models
  • 30x with 65mm/85mm Models
  • 63° Wide Apparent Angle of View
  • SWAROVISION and SWAROCLEAN Systems
  • Nitrogen-Filled, Water and Fogproof
  • Removable and Adjustable Forehead Rest
  • Twist-Up Rubber Eyecups
  • Integrated Aiming Aid with Reticle
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Swarovski 49903 overview

  • 1Description

Fully compatible with all versions of their ATX and STX spotting scope systems, Swarovski Optik's BTX 30x/35x Eyepiece Module represents the pinnacle of comfort for long-duration glassing sessions. The innovative design replaces the conventional single eyepiece with a dual-eyepiece binocular configuration that enables users to view with both eyes open, and with the eyepieces set at a 45° angle to the optical tube, their head is put in a natural viewing position. When mounted on the 65mm and 85mm models it has a 30x magnification, whereas the 95mm version is stepped up to 35x. Both models have a 63° wide apparent angle of view. To match the performance of the objective modules, this eyepiece module has the SWAROVISION system to improve color fidelity, contrast, and clarity; and SWAROCLEAN coatings help keep the lenses clear and easy to clean.

To improve stability and maintain the optimal head position relative to the eyepieces is an adjustable forehead rest. The rest can be removed if users find it more comfortable to use without it. Like the rest of the modules in the ATX/STX family, the Eyepiece module is nitrogen-filled to make it resistant to internal fogging when moving through extreme temperature changes, and is also O-ring sealed to be waterproof and submersible. Because finding targets through angled eyepieces is sometimes challenging, Swarovski provides an innovative aiming aid. The unmagnified device is placed in front of and to the side of the right eyepiece and is zeroed to the optical tube, so users simply look through the sight hole and center their subject in the reticle. Like the forehead rest, the aiming aid can be removed if users prefer to use the integrated sight on the objective modules shade.

Optical Performance
  • Dual identical eyepieces
  • 65/85mm Objective: 30x magnification with 65mm/85mm objective models; 35x magnification with 95mm model
  • Proprietary SWAROVISION system improves image contrast, color, and clarity
  • Wide Apparent Angle of View: 63° 
  • Field of View at 1000 Yards: 114' (65mm) / 111' (85mm) / 96' (95mm)
  • Exit Pupil: 2.2mm (65mm) / 2.9mm (85mm) / 2.7mm (95mm)
  • Long, 21mm eye relief on all models
SWAROVISION System
  • High-definition (HD) fluoride glass lenses eliminate chromatic aberrations for accurate color fidelity, and improved resolution and contrast
  • Field-flattener lenses correct spherical aberrations for distortion-free views, especially at the edges
  • SWAROTOP anti-reflective multi-coating that enhances light transmission
  • SWARODUR coatings provide enhanced scratch resistance
  • Non-stick SWAROCLEAN coatings on exposed lens surfaces ensure that water, dirt, sap, and oil can be easily removed without scratching or leaving residue
Use and Handling
  • Provides comfortable both-eyes-open viewing, with reduced, fatigue during long-duration observation sessions
  • Eyepieces set at 45° angle to optical tube for comfortable viewing while sitting, standing, or lying prone
  • Forehead rest improves viewing stability, is adjustable for optimal eye relief and viewing comfort, and is removable if preferred
  • Innovative aiming aid utilizes an unmagnified view with a sunburst-type reticle to find subjects faster and easier than using the angled eyepieces
  • 56-72mm interpupillary adjustment range
  • ±4 right-eye dioptric correction
  • Multi-position twist-up rubber eyecups offer comfortable use with or without eyewear
  • Simple bayonet mount for fast installation and removal
Construction Details
  • Nitrogen-filled and O-ring sealed to be water and fogproof
  • Submersible to 13.1' (4.0m)
  • Operating temperature: -13 to 131°F (-25 to 55°C)
  • Tethered one-piece ocular rainguard
  • Weight: 3.1 pounds
UPC: 708026499036
In the Box
Swarovski BTX 30x/35x Eyepiece Module for ATX/STX Spotting Scopes
  • Mount Cap
  • One-Piece Eyepiece Cap
  • Limited Lifetime Warranty
  • Table of Contents
    • 1Description

    Swarovski 49903 specs

    Magnification With 65 mm Scopes: 30x
    With 85 mm Scopes: 30x
    With 95 mm Scopes: 35x
    Angle of View With 65 mm Scopes: 2.1° (Actual)
    With 85 mm Scopes: 2.1° (Actual)
    With 96 mm Scopes: 1.8° (Actual)
    Field of View With 65 mm Scopes: 114' @ 1000 yd / 38 m @ 1000 m
    With 85 mm Scopes: 111' @ 1000 yd / 37 m @ 1000 m
    With 95 mm Scopes: 96' @ 1000 yd / 32 m @ 1000 m
    Exit Pupil Diameter With 65 mm Scopes: 2.2 mm
    With 85 mm Scopes: 2.9 mm
    With 95 mm Scopes: 2.7 mm
    Eye Relief 21.0 mm
    Diopter Correction -4.0 to +4.0
    Fogproof Yes, Nitrogen Filled
    Water Resistance Waterproof
    Dimensions L: 6.9" / L: 17.4 cm
    Weight 3.1 lb / 1.4 kg
    Packaging Info
    Package Weight 5.4 lb
    Box Dimensions (LxWxH) 11.2 x 8.0 x 5.3"

    Swarovski 49903 reviews

    BTX 30x/35x Eyepiece Module for ATX/STX Spotting Scopes is rated 5.0 out of 5 by 2.
    Rated 5 out of 5 by from Excellent way to have high power binocs The eyepiece module is like having an upscale set of binoculars with a Swarovski objective. Performance wise the package is superb. Interpupil distance is easily adjusted and there is a useful headrest. Focus does require moving your hand to the objective focus ring. Otherwise it is nearly like binoculars. There is no zoom and magnification is set at 30x. The aiming assist, a small scope to the right of the right eyepiece is outstanding at perfectly aiming the scope. The aiming assist is not protected by the SOC, but it is removable with a bit of fussing with a screwdriver. The total package with a 95mm objective is not much heavier than with the ATX eyepiece, but the BTX is significantly larger in width. In summary, a great spotting scope. My personal desired improvements would be a very slightly closer interpupil distance for use by children, and a better way of removing or protecting the aiming aid. But it still gets 5 stars.
    Date published: 2017-07-12
    Rated 5 out of 5 by from Very comfortable viewing The binocular like setup makes it very comfortable In use. I paired it with the ATX 95mm objective and the image is bright even though the light is split into two paths. The image quality is as expected for a top shelf spotting scope. There is not much else I can add to ota optical performance. I will just mention a few things about it when in use. I compared with the Leica scope in B & H and what made the sale was the focusing ring, it is so smooth and easy to grab and adjust when compared with the tiny and tight shell on the Leica Televid. The focus aid works fine to help with aiming the acope but it seems cheap being entirely made of plastic, and the forehead rest, for me, is useless. The BTX and 95mm ATX combination is a large scope and on the tripod, it is not very balanced when mounted on the balance rail. It feels awful on a ballhead as it "wants" to drop off in all different sides all the time if I don't hold on to it tight while moving it around. So trying to following a moving object does not work with a ball head. It works fine on a video pan and tilt head but I think a gimball head may be better. I am still looking for a set of tripod legs for this setup. I used a big manfrotto and a medium sized Gitzo but both have annoying vibrations. I am planning to test it on a set of wooden telescope legs. A minor complaint: the covers for the oculars are on a leash, which is great, but that for the objective is not and I struggle to find a place to store that large front cover when in use.
    Date published: 2018-07-18
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